The wikorum-engine StackExchange just announced they completely changed their business model. Basically, instead of buying a license from them, you now need to suggest a concept for a site. That concept can then be voted for by the community and if you can prove you have enough people interested, they will set up the site. [...]

We set up a StackExchange site for Entrepreneurs in Germany. Now, what do you call a StackExchange type of site? We’re proposing »Wikorum«. What do you think about it? You can vote and comment over at meta.StackExchange.com, or comment right here of course! This is an interesting experiment… I’m interested to see how it works [...]